CN-121984387-A - Normalization method and device for rotor loop and alternating current excitation of variable speed pumping and accumulating unit

CN121984387ACN 121984387 ACN121984387 ACN 121984387ACN-121984387-A

Abstract

The invention belongs to the technical field of alternating-current excitation speed-change pumped storage control, and provides a normalization method and a normalization device for a rotor loop and alternating-current excitation of a speed-change pumping and storage unit, wherein the normalization method for the rotor loop and the alternating-current excitation of the speed-change pumping and storage unit comprises the following steps of normalizing an alternating-current excitation control model and a first rotor loop model under a speed-change pumping and storage unit stator side per unit value system according to a pre-generated alternating-current excitation control loop compensation gain under the speed-change pumping and storage unit stator side per unit value system; and normalizing the alternating current excitation control model and the second rotor loop model under the rotor side per unit value system of the variable speed pumping and accumulating unit according to the pre-generated alternating current excitation control loop compensation gain under the rotor side per unit value system of the variable speed pumping and accumulating unit. The invention can realize the linearization and the accurate decoupling of the model of the variable speed pumping and accumulating unit, and ensure that the simulation model is consistent with the actual control system in terms of the physical meaning and the dynamic characteristic of parameters.

Inventors

LI SHANYING
LIU YINGLIN
XIE HUAN
YAN YIAN
LIANG HAO
LI CHANGYU
HUANG TIANXIAO
LIANG BEIHUA
CAO TIANZHI
LU WENQING

Assignees

国网冀北电力有限公司电力科学研究院
国网冀北电力有限公司
国家电网有限公司

Dates

Publication Date: 20260505
Application Date: 20251229

Claims (10)

1.A normalization method of a rotor loop and alternating current excitation of a variable speed pumping and accumulating unit is characterized by comprising the following steps: Normalizing an alternating current excitation control model and a first rotor loop model under a stator side per unit value system of a speed change pumping and accumulating unit according to a pre-generated alternating current excitation control loop compensation gain under the stator side per unit value system of the speed change pumping and accumulating unit, wherein the alternating current excitation control loop compensation gain under the stator side per unit value system is arranged in the alternating current excitation control loop under the stator side per unit value system; And normalizing the rotor side per unit value system lower alternating current excitation control model and the second rotor loop model of the variable speed pumping and accumulating unit according to the pre-generated rotor side per unit value system lower alternating current excitation control loop compensation gain, wherein the rotor side per unit value system lower alternating current excitation control loop compensation gain is arranged in the rotor side per unit value system lower alternating current excitation control loop.
2. The normalization method of claim 1, wherein the step of generating the ac excitation control loop compensation gain for the stator side per unit value system comprises: generating an alternating current excitation control loop compensation gain under the stator side per unit value system according to the direct current voltage of the converter and a reference value of the rotor voltage under the stator side per unit value system; The step of generating the compensation gain of the alternating current excitation control loop under the rotor side per unit value system comprises the following steps: And generating the compensation gain of the alternating current excitation control loop under the rotor side per unit value system according to the direct current voltage of the converter and the reference value of the rotor voltage under the rotor side per unit value system.
3. The normalization method according to claim 2, wherein the generating the ac excitation control loop compensation gain under the stator side per unit value system according to the dc voltage of the converter and the reference value of the rotor voltage under the stator side per unit value system includes: Wherein K 1 is the compensation gain of the alternating current excitation control loop under the stator side per unit value system, For a reference value of the rotor voltage in the stator side per unit value system, A direct current voltage of the converter; Generating an ac excitation control loop compensation gain under the rotor side per unit value system according to the dc voltage of the converter and a reference value of the rotor voltage under the rotor side per unit value system, including: wherein K 2 is the compensation gain of the alternating current excitation control loop under the rotor side per unit value system, For a reference value of the rotor voltage in the rotor-side per-unit value system, Is the direct voltage of the converter.
4. A normalization method according to any one of claims 1 to 3, wherein normalizing the ac excitation control model and the first rotor loop model of the variable speed pumping unit stator per unit system according to the pre-generated ac excitation control loop compensation gain of the variable speed pumping unit stator per unit system comprises: generating a first connection model under the stator side per unit value system according to the converter under the stator side per unit value system, wherein the first connection model is used for connecting an alternating current excitation controller under the stator side per unit value system with a motor; Generating an alternating current excitation control model under the stator side per unit value system according to the alternating current excitation controller under the stator side per unit value system, the first connection model and the motor; Determining an alternating current excitation control loop under the stator side per unit value system according to the alternating current excitation control model under the stator side per unit value system; Setting the compensation gain of the alternating current excitation control loop under the stator side per unit value system at the alternating current excitation control loop under the stator side per unit value system; The normalizing the alternating current excitation control model and the second rotor loop model under the rotor unit side per unit value system of the variable speed pumping and accumulating unit according to the pre-generated alternating current excitation control loop compensation gain under the rotor unit side per unit value system of the variable speed pumping and accumulating unit comprises the following steps: Generating a second connection model under the rotor side per unit value system according to the converter under the rotor side per unit value system, wherein the second connection model is used for connecting an alternating current excitation controller under the rotor side per unit value system with a motor; Generating an alternating current excitation control model under the rotor side per unit value system according to the alternating current excitation controller under the rotor side per unit value system, the second connection model and the motor; Determining an alternating current excitation control loop under the rotor side per unit value system according to the alternating current excitation control model under the rotor side per unit value system; and setting the compensation gain of the AC excitation control loop under the rotor side per unit value system at the AC excitation control loop under the rotor side per unit value system.
5. The normalization method according to claim 4, wherein setting the stator-side per-unit-system ac excitation control loop compensation gain to the stator-side per-unit-system ac excitation control loop comprises: updating the control voltage output by the alternating current excitation controller under the stator side per unit value system according to the compensation gain of the alternating current excitation control loop under the stator side per unit value system; setting the compensation gain of the rotor-side per unit value system lower alternating current excitation control loop at the rotor-side per unit value system lower alternating current excitation control loop, comprising: and updating the control voltage output by the AC excitation controller under the rotor side per unit value system according to the compensation gain of the AC excitation control loop under the rotor side per unit value system.
6. The normalization method according to claim 5, wherein updating the control voltage output by the ac excitation controller under the stator side per unit value system according to the ac excitation control loop compensation gain under the stator side per unit value system comprises: updating d-axis control voltage output by the alternating current excitation controller under the stator side per unit value system according to the alternating current excitation control loop compensation gain under the stator side per unit value system; updating the q-axis control voltage output by the alternating current excitation controller under the stator side per unit value system according to the alternating current excitation control loop compensation gain under the stator side per unit value system; Updating the control voltage output by the AC excitation controller under the rotor side per unit value system according to the compensation gain of the AC excitation control loop under the rotor side per unit value system, comprising: updating d-axis control voltage output by the AC excitation controller under the rotor side per unit value system according to the compensation gain of the AC excitation control loop under the rotor side per unit value system; and updating the q-axis control voltage output by the AC excitation controller under the rotor side per unit value system according to the compensation gain of the AC excitation control loop under the rotor side per unit value system.
7. A normalizing device for a rotor circuit and alternating current excitation of a variable speed pumping and accumulating unit, comprising: The device comprises a normalization first module, a first rotor loop model, a second module and a third module, wherein the normalization first module is used for normalizing an alternating current excitation control model under a stator unit value system of a speed change pumping and accumulating unit according to a pre-generated alternating current excitation control loop compensation gain under the stator unit value system of the speed change pumping and accumulating unit; the second normalization module is used for normalizing the alternating current excitation control model and the second rotor loop model under the rotor unit per unit value system of the variable speed pumping and accumulating unit according to the pre-generated alternating current excitation control loop compensation gain under the rotor unit per unit value system of the variable speed pumping and accumulating unit, wherein the alternating current excitation control loop compensation gain under the rotor unit value system is arranged in the alternating current excitation control loop under the rotor unit per unit value system.
8. A computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps of the method of normalizing a variable speed pumping and accumulating unit rotor circuit and ac excitation according to any one of claims 1 to 6.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor performs the steps of the method for normalizing a variable speed pumping and accumulating unit rotor circuit and ac excitation according to any one of claims 1 to 6 when the program is executed.
10. A computer readable storage medium having stored thereon a computer program, which when executed by a processor performs the steps of the method of normalizing a variable speed pumping and accumulating unit rotor circuit and ac excitation according to any one of claims 1 to 6.

Description

Normalization method and device for rotor loop and alternating current excitation of variable speed pumping and accumulating unit Technical Field The application belongs to the technical field of pumped storage control, in particular to the technical field of alternating-current excitation variable-speed pumped storage control, and particularly relates to a normalization method and device for a rotor loop and alternating-current excitation of a variable-speed pumping and storage unit. Background With the continuous development of new energy, the demand for adjusting the power source resources is becoming urgent. The pumped storage power station has various functions of peak regulation, valley filling, frequency modulation, phase modulation, energy storage, accident reserve, black start and the like, is the most mature and reliable regulating power supply at present, and becomes an important component of a novel electric power system with low carbon, safety, reliability, intelligent flexibility, economy and high efficiency. It is determined that ac-excited variable speed pumped storage is the dominant and necessary direction of current and future pumped storage technology development. The novel electric power system has the core value of breaking through the technical bottleneck of the traditional constant speed unit, realizing flexible regulation of the rotating speed of the unit through rotor alternating current excitation, thereby endowing the unprecedented operation flexibility and the power grid supporting capability of the pumped storage power station and perfectly adapting to the requirements of the novel electric power system taking new energy as a main body. At present, in order to improve the performance of a control system of the variable speed pumping and accumulating unit and realize the power decoupling control of an alternating current exciting motor, a vector orientation technology in alternating current speed regulation transmission can be introduced into the control of the variable speed pumping and accumulating unit system. Specifically, according to the structural characteristics of the variable speed pumping and accumulating unit, rotor current is decomposed into an active component and a reactive component through coordinate transformation. By adjusting the two rotor current components respectively, the active power and the reactive power of the alternating-current exciting motor can be controlled independently, thereby achieving the control objective of variable-speed constant-frequency power generation or electric operation (see fig. 1). In the prior art, the variable-speed pumped storage unit realizes double closed-loop control of a rotor-side converter based on a vector orientation method, and specifically comprises an active power (or rotating speed) outer ring, a reactive power (or voltage) outer ring, an active current inner ring and a reactive current inner ring (see figure 2). Further, if the control system realizes complete decoupling, the coupling term inside the controller and the coupling term in the ac excitation motor can be completely canceled, and the voltage output by the current inner loop is the given rotor voltage of the generator, as shown in fig. 3. And then the control parameters of the alternating current excitation system of the variable speed pumping and accumulating unit can be set according to the linearization model. By adopting the normalization method, even if the same parameters as the actual equipment are selected as the controller parameters in the simulation model, the phenomenon that the simulation result is inconsistent with the control characteristic of the actual device often occurs in simulation analysis. The reason for the phenomenon is mainly that the control system cannot accurately realize decoupling control of the motor because the set value of the alternating current excitation parameter under the per unit value system is different from the control parameter of the actual equipment, the coupling items in the internal and the alternating current excitation motor cannot be completely canceled, and the model of the variable speed pumping and accumulating unit cannot be constructed into a linear model, namely, the model normalization in the true sense cannot be realized. Disclosure of Invention The invention provides a normalization method of a rotor loop and alternating current excitation of a variable speed pumping and accumulating unit, and aims to solve at least part of the technical problems. The invention further aims to provide a normalizing device for the rotor loop and the alternating current excitation of the variable speed pumping and accumulating unit. It is still another object of the present invention to provide an electronic device including a memory and a processor, the memory storing a computer program, the processor executing the computer program to perform the steps of the above method for normalizing a variable speed pumping